add recommended solidity version

contracts/mainnet/connectors/liquity/events.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.7.0;
+pragma solidity ^0.7.6;
 
 contract Events {
 
@@ -39,4 +39,4 @@ contract Events {
     event LogStake(address indexed borrower, uint amount, uint getId);
     event LogUnstake(address indexed borrower, uint amount, uint setId);
     event LogClaimGains(address indexed borrower);
-}
+}

contracts/mainnet/connectors/liquity/helpers.sol

@@ -1,6 +1,6 @@
-pragma solidity ^0.7.0;
+pragma solidity ^0.7.6;
 
 import { DSMath } from "../../common/math.sol";
 import { Basic } from "../../common/basic.sol";
 
-abstract contract Helpers is DSMath, Basic {}
+abstract contract Helpers is DSMath, Basic {}

contracts/mainnet/connectors/liquity/interface.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.7.0;
+pragma solidity ^0.7.6;
 
 interface BorrowerOperationsLike {
     function openTrove(

contracts/mainnet/connectors/liquity/main.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.7.0;
+pragma solidity ^0.7.6;
 
 /**
  * @title Liquity.

hardhat.config.js

@@ -2,7 +2,7 @@ require("@nomiclabs/hardhat-waffle");
 require("@nomiclabs/hardhat-ethers");
 require("@tenderly/hardhat-tenderly");
 require("@nomiclabs/hardhat-etherscan");
-require("@nomiclabs/hardhat-web3");
+require("@nomiclabs/hardhat-web3")
 require("hardhat-deploy");
 require("hardhat-deploy-ethers");
 require("dotenv").config();
@@ -19,16 +19,16 @@ module.exports = {
   solidity: {
     compilers: [
       {
-        version: "0.7.6",
+        version: "0.7.6"
       },
       {
-        version: "0.6.0",
+        version: "0.6.0"
       },
       {
-        version: "0.6.2",
+        version: "0.6.2"
       },
       {
-        version: "0.6.5",
+        version: "0.6.5"
       },
     ],
   },
@@ -42,27 +42,27 @@ module.exports = {
       url: `https://eth-mainnet.alchemyapi.io/v2/${ALCHEMY_ID}`,
       accounts: [`0x${PRIVATE_KEY}`],
       timeout: 150000,
-      gasPrice: parseInt(utils.parseUnits("132", "gwei")),
+      gasPrice: parseInt(utils.parseUnits("132", "gwei"))
     },
     hardhat: {
       forking: {
         url: `https://eth-mainnet.alchemyapi.io/v2/${ALCHEMY_ID}`,
         blockNumber: 12433781,
       },
-      blockGasLimit: 12000000,
+      blockGasLimit: 12000000
     },
     matic: {
       url: "https://rpc-mainnet.maticvigil.com/",
       accounts: [`0x${PRIVATE_KEY}`],
       timeout: 150000,
-      gasPrice: parseInt(utils.parseUnits("1", "gwei")),
+      gasPrice: parseInt(utils.parseUnits("1", "gwei"))
     },
   },
   etherscan: {
-    apiKey: process.env.ETHERSCAN_API_KEY,
+    apiKey: process.env.ETHERSCAN_API_KEY
   },
   tenderly: {
     project: process.env.TENDERLY_PROJECT,
-    username: process.env.TENDERLY_USERNAME,
+    username: process.env.TENDERLY_USERNAME
   },
 };